Hi: I am in the process of getting a Garmin 250XL to talk to My Skyview. I used Pin #19-RS232 out from my Garmin to Serial #4 RX pin #9 of the Skyview. I selected Generic Aviation, GPS1, Baud 9600, and none to RX out. I set Serial #5 to none and none. With the system on and the GPS set, Skyview still says GPS fail. What have I done wrong?